*-* On Sat, 25 Apr 2009, at 05:46:49 -0700,
*-* In Article
*-* Marco wrote
*-* About Modem model versus download speed?
> How much does my older cable modem affect download speed?
Probably not much. According to
changes in DOCSIS 2.0 over DOCSIS 1.1 are on the upstream channel.
There's no mention of any enhancements to the downstream channel.
Furthermore, <http://en.wikipedia.org/wiki/DOCSIS#Speed_Table> lists
the same downstream "Maximum usable speed" for both versions.
> How much speed loss would be expected from a wireless router in the
> I'm thinking of down-tiering to Comcast 1 Mbps service (we do very
> little video) would I expect a similar percentage drop?
That's the service level I have.
> from my post at alt . online-service . comcast
> download speed testing
> I get around 4.5 to 5.5 Mbps using these:
On three tests I get 0.875, 0.900, and 0.872 Mbps download speed,
and 0.365, 0.364, and 0.362 Mbps upload speeds, using their Boston,
Mass., server, the one closest to me.
928, 929, and 880 Kbps download, 360, 365, and 191 Kbps upload,
using New York City.
> but only get 2.7 to 3 Mbps using this site:
0.87, 0.87, and 0.90 Mbps download, 0.36, 0.36, and 0.36, upload,
using Portland, Maine. As you can see, my results there are right in
line with the other two, so I don't know why yours are so much slower
than the others.
Note that I have a router, and I'm streaming Internet radio to my
other computer, so I know that these tests aren't getting the full
benefit of my available bandwidth.
> according to Comcast I should be getting 6 Mbps
If you read the fine print you'll find that that's *UP TO* 6 Mbps.
> Anybody test lately and which sites seem more believable?
> (should I complain that I don't get 6 Mbps)
> upload speed seems more consistent around 1 Mbps
> It seems that the chosen server for each test excessively
> influences the test
> a response:
>> Old modem? Post modem model and version numbers
>> "IF" your modem supports it check signal power and snr at
>> http://192.168.100.1/ If you get the right person when calling
>> Comast they might check your signal levels from their end if your
>> modem doesn't support it..
> my followup:
> SurfBoard 3100 appears to be DOCSIS 1.1
Mine is a Motorola SURFboard SB5100, which supports DOCSIS 2.0.
> Downstream Value
> Signal to Noise Ratio 37 dB
36 dB here According to this post, from December, 2004:
it should be above 30, so we're both good there.
> Power Level 0 dBmV
4 dBmV here From the same post: "The recommendation is +15 to
-15, so again we're both good. :-)
> The Downstream Power Level reading is a snapshot taken at the time
> this page was requested. Please Reload/Refresh this Page for a new
> (this did not change on refresh)
> Upstream Value
> Power Level 56 dBmV
49 dBmV here Also from the same post: "Upstream should be below
55db", so you're marginally high there.
> what is a good reading?
From another old thread here is what a poster was told by a Cox
level 2 tech:
SNR 30+ mid 30's
Down Power 0 0-3
Up Power 50 or lower 30-50
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